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If you're using Office 365 operated by 21Vianet, go to this Active users page.

Select the box next to the name of the user to whom you want to assign a license.

On the right, in the Product licenses row, choose Edit.

In the Product licenses pane, switch the toggle to the On position for the license that you want to assign to this user.

By default, all services associated with that license are automatically assigned to the user. To limit which services are available to the user, switch the toggles to the Off position for the services that you don't want that user to have.

At the bottom of the Product licenses pane, choose Save > Close > Close.

The Product licenses pane showing which licenses the user has.

In the Admin center, go to the Active users page, or choose Users > Active users.

Switch the toggle to the On position for the license that you want the selected users to have.

By default, all services associated with that license are automatically assigned to the user. To limit which services are available to the user, switch to toggles to the Off position for the services that you don't want the user to have.

At the bottom of the Add to existing products pane, choose Add > Close > Close.

The Product licenses pane showing which licenses the users have.

Move users to a different subscription

If you have more than one subscription, and you have users who already have a license for one subscription, but you want to move them to another subscription, you can replace their existing license with a different one.

In the Admin center, go to the Active users page, or choose Users > Active users.

Switch the toggle to the On position for the licenses you want to assign to these users.

To limit which services are available to the user, switch the toggles to the Off position for the services that you don't want that user to have. Any previous license assignments for the selected users will be removed.

At the bottom of the Replace existing products pane, select Replace > Close > Close.